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Petrosedum subulatum

Stonecrop

Family CrassulaceaeGenus Petrosedum

Branched stems topped with clusters of pale yellow-green buds and small starry flowers
FlowereloniceraCC0

About the plant

What it is and where it grows — not part of any germination protocol.

Habit
succulent subshrubPlants of the World Online
Flower
Pale yellowRead from the photograph on this page

Toxicity is noted only where a source states it. No note here is not a finding of safety.

Sources: Plants of the World Online — Royal Botanic Gardens, Kew; Read from the photograph on this page — Deno's Garden.

This source reports three treatments. All are shown.

Protocol 1

DerivedN. C. Deno, 1993

Difficulty Moderate Rated by us, not by the source.

Start around March 16, 2027 for a May 3 last frost.

  1. Sow and cover

    Temperature: 70°F 21°C

No stated waiting before sowing. Then 20 days to germinate.

30% germination in 11–20 days.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sedum p. 213Public domain
Show the original text
Sedum (Crassulaceae). All Sedums tolerated OS and germ. largely at 70. Germination in S. subulatum germ. 70(30% in 11-20 d) and 40(5%)-70(10%). Seed sown outdoors in November germ. 22%, partly in November and partly in February during a warm spell.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sedum p. 213. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 2

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Sow around November 2027 — a date the source gives, not one counted back from a May 3 last frost. Too late for spring 2027 — that needed starting on November 2026.

  1. Sow outdoors and leave it

    Sown outdoors in November.

No stated waiting before sowing. Germination time not stated; 21 days assumed.

22% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sedum p. 213Public domain
Show the original text
Sedum (Crassulaceae). All Sedums tolerated OS and germ. largely at 70. Germination in S. subulatum germ. 70(30% in 11-20 d) and 40(5%)-70(10%). Seed sown outdoors in November germ. 22%, partly in November and partly in February during a warm spell.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sedum p. 213. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

Protocol 3

DerivedN. C. Deno, 1993

Difficulty High Rated by us, not by the source.

Start around December 15, 2026 for a May 3 last frost.

  1. Cold moist stratification

    Duration: 90 daysTemperature: 40°F 4°C

    5 germinated in this phase.

  2. Warm moist stratification

    Duration: 90 daysTemperature: 70°F 21°C

about 3 months from start to step 2. Germination happens during step 2; time not stated, 21 days assumed.

10% germination.

Seed Germination Theory and Practice, 2nd ed. — N. C. Deno, 1993 · Ch. 20, Sedum p. 213Public domain
Show the original text
Sedum (Crassulaceae). All Sedums tolerated OS and germ. largely at 70. Germination in S. subulatum germ. 70(30% in 11-20 d) and 40(5%)-70(10%). Seed sown outdoors in November germ. 22%, partly in November and partly in February during a warm spell.
Seed Germination Theory and Practice, 2nd ed., Ch. 20, Sedum p. 213. Quoted exactly. Every value on this card comes from this record, except the difficulty rating, which is ours; the step names come from a fixed list.

How each step is done, in Deno’s words, and what Verified and Derived mean.

Germination trials

Readers’ own records of sowing this species, published after review. Share your trial · All trials

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